https://www.independent.co.uk/news/world/europe/ferdinand-ii-aragon-spanish-king-code-500-year-old-solved-a8193646.html
this is the Ferdinand who bankrolled Columbus.
Hope these letters are published at some point. Ferdinand was a notorious cheapskate and Gonsalvo de Cordoba, El Gran Capitan, spent the last twelve years of his life defending his expenses during the campaigns in Italy.